BD14222G-CTR

Overview

The BD14222G-CTR is a single-channel automotive current sense amplifier from ROHM Semiconductor, designed for high-precision applications. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a wide common-mode voltage range of -14 V to +80 V. The device provides an analog voltage output with a fixed gain of 100 V/V. Key electrical specifications include a maximum input offset voltage of 500 µV, a typical input bias current of 1 µA, and a -3 dB bandwidth of 40 kHz. It consumes 240 µA of supply current and functions within a temperature range of -40°C to +125°C.

Feature Summary

• High-precision current sensing with matched internal gain resistors to minimize gain error and offset voltage variations across temperature changes.
• Wide common-mode voltage tolerance supporting negative inputs down to -14 V and positive inputs up to +80 V, enabling reverse polarity protection.
• Low power consumption with a typical operating current of 240 µA, suitable for energy-efficient automotive systems.
• Automotive-grade reliability certified under AEC-Q100 standards for use in harsh environmental conditions.

Applications

• Current monitoring and overcurrent detection in 48V DC/DC converters
• Battery management systems for electric vehicles (xEV) and auxiliary batteries
• Electric compressor control circuits
• Redundant power supply architectures

Procurement Notes

Verify the specific suffix 'CTR' indicates tape-and-reel packaging when sourcing components. Confirm that the part meets AEC-Q100 Grade 1 requirements for your specific automotive application environment. Ensure compatibility with the required gain setting, as this model corresponds to the 100 V/V variant within the BD1422x series. Check for RoHS compliance status if restricted materials are a concern for your manufacturing process.

Selection Notes

Select the BD14222G-CTR when a gain of 100 V/V is required for precise low-current measurements in high-voltage environments. This model is distinct from the BD14220 (25 V/V) and BD14221 (50 V/V) variants. Consider this component for designs needing robust negative voltage tolerance and high accuracy without external trimming resistors. Evaluate the SOT-23-6 package size against board space constraints compared to other series options.

Part Context

This component belongs to the BD142xx series of high-precision automotive current sense amplifiers. The series includes models with different gains and packages, such as the BD1423xFVJ-C for higher voltage applications. The BD1422xG-C sub-series specifically targets 5V/12V power networks but supports up to 80V common-mode voltages. These devices integrate two-stage amplifier structures using chopper and auto-zero techniques for stability.

Replacement Considerations

Direct substitutes within the same family include BD14220G-CTR (25 V/V gain) and BD14221G-CTR (50 V/V gain). For higher voltage support in similar packages, consider the BD1423x series. Verify pinout compatibility and gain requirements before swapping between these variants.